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Old 03-12-2008, 12:53 PM   #26
Turn in Concepts
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What we need is this:

Stock rotor that did not rub.
Rotor that does rub - we need aftermarket AND "stock" from dealer replacement.

The reason I say "stock" is I have to wonder if some dealers are using "OEM STYLE" replacements vs. getting them from Subaru to save to $$

We then need to take some measurements.

I know this comes up every few months, but if this happened with all of them then it would be coming up every few days so that leads me to think about my theory, and wonder if there isn't some switching going on somewhere.
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Old 03-12-2008, 01:24 PM   #27
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I'm pretty sure this is the same problem I have on my car. I'm still rocking my stock rotors with 90K on them. The noise started faintly about 10kmi ago, but has now progressed to a pretty loud squeal when the car is coasting. The noise goes away when the car is under accelerating or braking. I tried removing the rotor and cleaning the rust in the groove with a wire brush. The noise went away for a day, then came back.

My guess is that the noise is due to the combination of rust buildup and worn bearings. I'm due for some new rotors when my rear pads are done... I'll report back then
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Old 03-12-2008, 01:30 PM   #28
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Quote:
Originally Posted by Turn in Concepts View Post
What we need is this:

Stock rotor that did not rub.
Rotor that does rub - we need aftermarket AND "stock" from dealer replacement.

The reason I say "stock" is I have to wonder if some dealers are using "OEM STYLE" replacements vs. getting them from Subaru to save to $$

We then need to take some measurements.

I know this comes up every few months, but if this happened with all of them then it would be coming up every few days so that leads me to think about my theory, and wonder if there isn't some switching going on somewhere.

I think you may be on to something. When I had the issue it was after replacement rotors were installed when the stock rotors (from the factory were not an issue) were fine. I have some pics of were the rotor was rubbing I will try to post them tonight sometime. I know looking at my replacements the rear lip of the rotor was slight taller then stock causing the rubbing. I can't compare now since I don't have the old stock rotors to look at anymore.

Last edited by red5001; 03-12-2008 at 08:40 PM. Reason: Posted pics
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Old 03-17-2008, 12:30 PM   #29
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OP'S, Brembo's, and factory are all identical. a call to subaru parts brought nothing, tech line ditto. this happened once before here but we can't recall the fix. for this one we're leaning towards bending the backing plate a little with a chisel to get it to fit. i'll let you know. the odd thing is we sell a ton of these rotors and this is only the second time it came up.
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Old 04-10-2008, 10:30 PM   #30
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I can't wait to check this and hopefully fix this issue on the weekend. Thanks guys!!!!
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Old 04-12-2008, 11:05 PM   #31
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Well I had a look on Saturday and my rotor and dust shield looks EXACTLY like the pictures above. Sanded the area and banged on the dust shield with a screwdriver and a hammer and no more noise.
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Old 04-19-2008, 01:33 PM   #32
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Does anyone have a service bulletin or similar for this issue if "Subaru instructs techs to grind it down"? I have had this issue and my service shop says 'we heard it but don't know what it was'...
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Old 04-19-2008, 05:39 PM   #33
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+1 stocker with the grinding noise. i recently replaced pads with stock type pads and changed the fluid. i can't remember if it made noise prior to changing pads though. if it did, i probably chalked it up to pad wear indicators. taking turns in a parking lot and it's really easy to hear with the windows down. oh, and now, after 5k or so on the brakes, i'm getting some random brake squeal. annoying... yes. but the brakes stop well and otherwise work right. once i get a garage, i'll dig around in there and see if i've got the ring o' corrosion.
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Old 05-05-2008, 09:06 AM   #34
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I had this same problem. Grinding noise from left rear of car while turning right at low speeds. After finding this thread, I checked and found a small amount of rust on the e-brake dust shield, which was rubbing the inner ring of the rotor. A few minutes with the Dremel tool and all is quiet again.
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Old 05-12-2008, 01:12 PM   #35
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Default What the heck is going on?

I had this same problem recently (actually- I "fixed" the problem this morning I called in to work to let my boss know I had car trouble).

My '04 WRX wagon with 70,000 miles had been making this faint metalic "scuff- scuff-scuff" sound when going slowly through left hand turns. If I increased my speed through a left hand turn- the succession of the sound increased as well. My wife sat in the rear passenger seat and held the door open as I went through some slow left hand turns, and she was 100% certain that the sound was coming from the rear passenger-side wheel. I took the wheel off and looked at the components, looking for ANY sign of rubbing anywhere, and could find nothing. I looked at my brake pads (the originals from new) and saw that they were low, so I replaced them, but that did not affect the problem at all. Frustrated- I took the car to my mechanic (not a Subaru-specific guy, but a long time friend and in my opinion *brilliant* mechanic) who went for a ride with me and heard the noise and the scraping sounded to him as if it was something superficial like a rock stuck between the rotor and the backing plate or something. I told him that I suspected that the bearing was going bad, but my mechanic told me that if it were- it would be making a grinding noise when going in a straight line as well (which it does not do). A very close inspection on a lift from underneath yielded nothing. Everything looked fine.

I read this thread, and decided to pop off the rotor to see if I had the same scrape as is pictured, and I DO- in the EXACT same place. There is no rust build up- there is no grime or dirt or anything- just a shiny 1/2 inch-long scrape at about 7 0'clock on the backing plate just outside of the e-brake adjustment spline. The rotor also has a lightly polished innermost race where it had been contacting the backing plate. The innermost race is not on the rotor surface itself, and is not visible unless you completely remove the rotor from the axle. Just for the heck of it- since I had everything apart- I carefully tapped the worn area of the backing plate with a square punch in an effort to bend it ever so slightly away from the rotor. I assumed that I did bend it, but you really could not tell visually or tactually. Just because I was in there- I also ground down the area with a fine-tipped dremel attachment that I happened to have. I didn't take very much metal away but I wanted to try what others had tried with excellent results.

I put the rotor, caliper and wheel back on- the the noise is completely gone... but WHY did the rotor scrape the backing plate in the first place? I hate "fixing" things in this way, but it definitely did eliminate the rubbing. What is the larger problem here? Is this symptom the early sign of a failing bearing? There HAS TO BE a reason for this, and I really want to know what it is. I'm not looking to avoid putting a new bearing in the car if that is what it needs, but enough people have posted on this topic to make me wonder if the bearing is really going bad on this relatively low-mileage, gently driven car that I purchased new or if there is something else going on here.

Lastly- are there any true Subaru techs out there who can tell me definitively if there is a common practice of grinding this backing plate down when servicing the brakes or bearings? Is there a TSB about this? I'm not going to consider my car "fixed" until I understand why this happened in the first place.

I know this has been long-winded, but I want to thank all of you who posted your description, pictures and comments to this thread. I truly would be at the mercy of my mechanic (or even worse World Subaru in NJ) if it were not for NASIOC. Thanks again!

TONY
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Old 05-12-2008, 03:05 PM   #36
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Default Definitive Answer to the Rotational Grinding Problem

OK- I stopped by my local Subaru Dealership (World Subaru, Tinton Falls, NJ). I spoke with a service writer and asked to speak with a tech (which they were reluctasnt to do). Luckily (for me) a tech stepped into the office at that moment, and the service writer asked him if he had a moment for a quick question.

I asked the tech if he encountered the scraping problem regarding the rear brakes of Imprezas and he knew *EXACTLY* what I was talking about. He said that they see this problem all the time. It is NOT a rear bearing issue at all. If it were- you'd hear grinding whenever the car is in motion. It is a backing plate issue. As the car ages- the backing plate hardware accumulates rust, which pushes the backing plate forward toward the rotor. Taking everything apart and cleaning all of the bolts, nuts, washers and their mating surfaces will solve the problem (until it "blooms" again) but the dealership fix is to grind down the innermost part of the inside of the rotor. The design did not allow for this expansion, so the tolerence becomes too tight. That is the legitimate fix- it is not a hack. Grinding down the backing plate (which is what I did) is not the recommended fix- although it does solve the problem.

So there you have it. It sounded crazy to me before I asked a tech. Once it was explained to me by someone who works for Subaru- as a factory trained tech- I am satisfied with the repair and the reasons for it.

By the way- the tech told me that if enough people complained- Subaru would be forced to issue a TSB, and judging by the number of these that he has seen- a recall...

Thanks again, guys!

TONY
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Old 05-12-2008, 04:31 PM   #37
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That is good I guess that the Tech knows of the problem. I still have a feeling its has something to do with the bearings wearing. If it was just the backing plate pushing out why does it make the noise only on turns that load that particular wheel. If it was just the backing plate it should make the noise in a straight line as well. I don't think the bearings are bad just worn and have a little more play then normal. Its hard to say with out measuring things between a new and old car as far as bearing play is concered. I think it is a combination of things.
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Old 05-12-2008, 04:49 PM   #38
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can't believe I've never seen this thread before...or I did and I forgot.

A couple months ago after I swapped in new 4/2 pots, rotors and pads, and rear suspension bits I started getting a "woong woong woooong" sound from the rear of the car on very very slow turns, usually on slanted surfaces. The sound wasn't there before the install.

I figured I didn't torque down the suspension bits, or the brake hardware correctly, or it was my bearings....but after reading this I'm going to check out this fix first.

thanks for the heads up
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Old 05-19-2008, 10:07 PM   #39
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wow, this thread is a winner...just took me all day to find.

Got my rotors off....seeing the exact same problem. Gonna try to find someone to take that lip off a new set of rotors tomorrow.

anway, when I took off my rear rotors i think I messed up my ABS because the antilocking is kicking in all the time now. I don't really know much about ABS, hopefully i didn't seriously f something up.

Anyway, great thread!!!
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Old 06-09-2008, 04:05 PM   #40
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After playing around more, I think its perhaps rust buildup behind the shield that's deflecting it out into the rotor...
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Old 06-09-2008, 07:11 PM   #41
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Quote:
Originally Posted by REX8 View Post
After playing around more, I think its perhaps rust buildup behind the shield that's deflecting it out into the rotor...
Did you not read post number 36?
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Old 06-09-2008, 07:15 PM   #42
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Quote:
Originally Posted by ciper View Post
Did you not read post number 36?
Guess not...

Last edited by REX8; 06-09-2008 at 07:28 PM.
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Old 06-09-2008, 09:12 PM   #43
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I think that tech might just merit a raise...

I don't have tyhe rust issue down here - but we've seen it on a few cars - and now that I think - they are from up north....

Quote:
Originally Posted by mzdrati View Post
OK- I stopped by my local Subaru Dealership (World Subaru, Tinton Falls, NJ). I spoke with a service writer and asked to speak with a tech (which they were reluctasnt to do). Luckily (for me) a tech stepped into the office at that moment, and the service writer asked him if he had a moment for a quick question.

I asked the tech if he encountered the scraping problem regarding the rear brakes of Imprezas and he knew *EXACTLY* what I was talking about. He said that they see this problem all the time. It is NOT a rear bearing issue at all. If it were- you'd hear grinding whenever the car is in motion. It is a backing plate issue. As the car ages- the backing plate hardware accumulates rust, which pushes the backing plate forward toward the rotor. Taking everything apart and cleaning all of the bolts, nuts, washers and their mating surfaces will solve the problem (until it "blooms" again) but the dealership fix is to grind down the innermost part of the inside of the rotor. The design did not allow for this expansion, so the tolerence becomes too tight. That is the legitimate fix- it is not a hack. Grinding down the backing plate (which is what I did) is not the recommended fix- although it does solve the problem.

So there you have it. It sounded crazy to me before I asked a tech. Once it was explained to me by someone who works for Subaru- as a factory trained tech- I am satisfied with the repair and the reasons for it.

By the way- the tech told me that if enough people complained- Subaru would be forced to issue a TSB, and judging by the number of these that he has seen- a recall...

Thanks again, guys!

TONY
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Old 06-09-2008, 10:32 PM   #44
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I also had that problem, replaced rear rotors with cheap AutoZone units, and had the right rear make a scraping sound when making right turns. My fix was to wait and see if it would go away on it's own, which it did after about a week. My car has six years worth of winter salt experience, so the rust explaination sounds plausible to me.
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Old 06-14-2008, 07:11 PM   #45
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Default I had same problem - pics attached

I have the same problem as well. This thread lifted my spirits. Had the rotor off earlier today and saw both the scape marks on the backing plate and the rotor - but was unable to get any play at all from the wheel before I took it off. And I was really putting my back into it. So I'm convinced I have nothing to worry about wrt the bearing. By the way, rotors and pads are new - I used the Brembo rotors that are apparently identical to stock. Problem arose before changing the brakes and persisted afterwords.

It looks like I'll be going to town on it with my dremel and hammer tonight. Here are some pics showing both the backing plate and the rotor - they're probably not any better than previous pics in this thread, but maybe they'll be helpful to someone.

Backing plate - scrape doesn't look "shiny" in this picture because I had already taken a wire brush to it:


Rotor lip:
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Old 08-25-2008, 05:09 PM   #46
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i had this grinding nosie in the rear when i installed new rear rotors and pads and this ^^^^^ was the problem. i see alot of "grinding nosie" threads; this should be a sticky its a very good starting point
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Old 08-25-2008, 05:58 PM   #47
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Add this one to the list, 1997 Legacy L with 187K on it. Just did rear brakes (pads/rotors) and had the identical issue. On this car it was the drivers side rear that had the rub. If I the common sense to search the various forums, I would have come up with the explanation. My solution was to work on the backing plate with a wire brush till the noise was gone. Thanks to mzdrati for having the patience to follow up with a dealership.
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Old 09-04-2008, 12:48 PM   #48
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wow, i have this exact same problem. When making right turns on the drivers side rear wheel. I though i messed something up in a brake job, but i knew in my head i didn't. I did the wheel again and didnt see anything out of the ordinary, put it back together and it still did it . Then i was like, "ohh no, wheel bearing". I posted and someone linked me to this thread. I will try to pull it apart this weekend and see. I will post back when i do. Hopefully this is it...
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Old 09-05-2008, 02:45 PM   #49
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Wow - I have been hearing this exact noise for a while now while making low speed right hand turns. Just today at lunch I was cursing it! I was afraid that the bearings were going on the right rear on my '06 - already!

I'm going to disassemble and check this out this weekend. Thanks for the input everyone!
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Old 09-05-2008, 03:51 PM   #50
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This problem must of existed for a long time. I had the same exact problem with my 00RS, the noise and the machine lip off the OEM rotors. When I did the rear brake job I got a set of NAPPA rotors. When I finished the brake job I put the wheels on and guess what my rear wheels were frozen. When I took off the wheels and rotors I finally notice the tall lip on the Nappa rotor compared to the OEM which was machine down. At first I thought NAPPA just mistakenly gave a set of rotors from aonther year, so I just machine it off on a lathe. But I never figured out why that lip on the OEM rotor machine off.
All is well now.
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